How do I make this dark colored overlay/filter effect and what are these effects called? [duplicate]

Question

I am trying to make the color effect as seen above. I have considered color overlays but I think its more than putting a color overlay over a picture. Any help is much appreciated.

I am using Photoshop.

Also one more thing, what are these color effects called?

Answer 1

Simply use gradient maps buddy. Then use black and red, or any other color that you prefer.